[ 1921 J 
XI. Insecta. 
Insecta. 27 
550. — Eldering, Mile. F. J. Acqui- 
sition d’habitudes par les insectes. 
Arch. Ncerlandaises, La Haye 3 1919 
pp. 469-490. 
551. — Elliott, E. A.- Three new 
Stephanidae from Java. Entomologist 
London 54 1921 pp. 256 & 257. 
[Hymenoptera.] 
552. — Eltringham, E. Four new 
African species of Neptis. Ent. Mag. 
London 57 1921 pp. 26-29. [Lepido- 
ptera .] 
553. — Emery, C. Hymenoptera , Fam. 
Formicidae subfam. Myrmicinae. Gen. 
Ins. Faso. 174a Bruxelles 1921 pp. 1-94 
pis. i-vii. 
554. — Emery, C. Specific names 
repeated in the Linnean genus Formica. 
Psyche Boston Mass. 28 1921 pp. 
24-26. [Hymenoptera.] 
555. — Emery, C. Quels sont les 
facteurs du polymorphisms du sex 
feminin chez les fourmis ? Rev. gen. 
sci. Paris 32 1921 pp. 737-741. [Hy- 
menoptera.] 
556. — Emery, C. Notes critiques de 
Myrraecologie. Ann. Soc. ent. Belgique 
Bruxelles 61 1921 pp. 313-319. [ Hy - 
menoptera .] 
557. — Emilio, G. and Rasetti, F. 
Note Entomologiche. Bull. Soc. ent. 
Ital. Firenze 51 1921 pp. 19-27. 
558. — Emmerez de Charmoy, D. d’. 
Insect pests of various minor crops 
and fruit trees in Mauritius. Bull. ent. 
Res. London 12 1921 pp. 181-190. 
559. — Enderlein. G. Psyllidologica, 
vi. Zool. Anz. Leipzig 52 1921 pp. 
115-122 2 figs. [Hemiptera.] 
560. — Enderlein, G. Zur Kenntnis 
der Pterocallinen. Zool. Anz. Leipzig 
52 1921 pp. 211-219. [ Diptera .] 
561. — Enderlein, G. Dipterologisclie 
studien xvii. Zool. Anz. Leipzig 52 
1921 pp. 219-232. 
562. — Enderlein, G. Die systema- 
tische Gliederung der Simuliiden. 
Zugleich eine Bitte um tlberlassung 
von Simuliidenmaterial. Zool. Anz. 
Leipzig 53 1921 pp. 43-46. [Diptera. ] 
563. — Enderlein, G. Ein fossiler 
Simuliiden-Riese. Zool. Anz. Leipzig 
53 1921 pp. 74 & 75. [Diptera.] 
564. — Enderlein, G. Beitrilge zur 
Kenntnis aussereuropaische Ichneu- 
moniden, v. tlber die Familie Ophioni- 
dae. Ent. Zeitung Stettin 82 1921 
pp. 3-46. [ Hymenoptera .] 
565. — Enderlein, G. Beitrage zur 
Kenntnis auszereuropaischer Ichneu- 
moniden, vi. Zwei neue Pimpliden. 
Ent. Zeitung Stettin 82 1921 pp. 46-47. 
[Hymenoptera.] 
566. — Englehardt, G. P. A note on 
the occurrence of two Pyralids (Lepi- 
doptera, . Pyralidae). Insecutor Ins. 
Menstr. Washington 9 1921 p. 160. 
567. — Enslin, E. Ueber Schnarrheu- 
schrecken. Ent. Rundsch. Stuttgart 38 
1921 pp. 21-22 40. [ Orthoptera .] 
568. — Enslin, E. Beitrage zur 
Kenntnis der Tenthredinoulea, vii. 
( Hym .) 13 Die Gattung Pelmatopus 
Htg. Ent. Mitt. Berlin 10 1921 pp. 
181-185 3 text-figs. 
569. — Enslin, E. Beitrage zur 
Kenntnis der Hymenoptera. D. ent. 
Zs. Berlin 1921 pp. 59-64 figs. 
570. — Enslin, E. Beitrage zur 
Kenntnis der Hymenopteren, ii. D. ent. 
Zs. Berlin 1921 pp. 279-285 figs. 
571. — Enslin, E. Beitrag zur Biologie 
der Osmia xanthomelana K. ( fusciformis 
Latr.). Zs. wiss. Insektenbiol. Berlin 
16 1921 pp. 127-132 figs. [Hymeno- 
ptera.] 
572. — Ernst, Oh. Uber die psychis- 
chen Fahigkeiten der Ameisen. Jahrb. 
Nassau. Ver. Wiesbaden 69 1916 pp. 
37-55 figs. [Hymenoptera.] 
573. — Esaki, T. On Some Examples 
of Miscegenation in Insects. Konch. 
Sek. Gifu 25 1921 pp. 220-221. 
574. — Esben-Petersen, P. Mecoptera. 
Coll. Selys Longchamps 5 (2) Bruxelles 
1921 pp. 1-172 pis. i & ii, text-figs. 
1-188. [ Neuroptera.] 
575. — Esben-Petersen, P. Descrip- 
tion of a new genus and species of 
Myrmeleonidae from Japan. Videns. 
Medd. nat. For. Kjobenhavn 72 pp. 
127-128 fig. [Neuroptera.] 
576. — Esben-Petersen, P. Notes 
concerning some Neuroptera in the 
Helsingfors Museum together with a 
description of Hemerobius poppii. 
Notulae Ent. Helsingfors 1 1921 
pp. 38-43, figs. 1-7. 
